export default {
 
  namespaced:true,
  state: ()=>({
    cart:JSON.parse(uni.getStorageSync('cart')||'[]'),
  }),
  mutations:{
    addToCart(state,goods){
      const findResult=state.cart.find(x=>x.goods_id===goods.goods_id)
      // console.log(findResult)
      if(!findResult) {
        state.cart.push(goods)
        } else {
          findResult.goods_count++
          }
        this.commit('m_cart/saveToStorage')
      // console.log(state.cart)
    },
    saveToStorage(state){
      uni.setStorageSync('cart',JSON.stringify(state.cart))
    },
    updateGoodsState(state, goods) {
      // 根据 goods_id 查询购物车中对应商品的信息对象
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
    
      // 有对应的商品信息对象
      if (findResult) {
        // 更新对应商品的勾选状态
        findResult.goods_state = goods.goods_state
        // 持久化存储到本地
        this.commit('m_cart/saveToStorage')
      }
    },
    updateGoodsNumber(state,goods){
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
      if (findResult) {
        findResult.goods_count=goods.goods_count
        this.commit('m_cart/saveToStorage')
    }
    
   },
   removeGoodsById(state, goods_id) {
     // 调用数组的 filter 方法进行过滤
     state.cart = state.cart.filter(x => x.goods_id !== goods_id)
     // 持久化存储到本地
     this.commit('m_cart/saveToStorage')
   },
   changeGoodsState(state,newState){
     state.cart.forEach(x=>x.goods_state=newState)
     this.commit('m_cart/saveToStorage')
   }
 
},
 getters:{
    total(state){
      // let c=0;
      // state.cart.forEach(goods=>c+=goods.goods_count)
      // return c
      return state.cart.reduce((total,item)=>total+=item.goods_count,0)
    },
    checkedCount(state){
      return state.cart.filter(x=>x.goods_state).reduce((total,item)=>total+=item.goods_count,0)
    },
    checkedGoodsAmount(state){
      return state.cart.filter(x=>x.goods_state).reduce((total,item)=>total+=item.goods_price*item.goods_count,0).toFixed(2)
    }
  },
  }